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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942f6636530f55f49059881a4751cb4818d643e2a2336817b248ba54534a63a4' 
  AND token = 'uKEi7J0Mt7jiRdFI2pcuRpGklvafK5pqM0hjUY4/988=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}